/*
 *  Copyright 2011 yura.
 * 
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 * 
 *       http://www.apache.org/licenses/LICENSE-2.0
 * 
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *  under the License.
 */

package org.opu.yyminijava.visitor;

import java.io.PrintStream;
import org.opu.yyminijava.syntaxtree.Rule;

/**
 *
 * @author yura
 */
public class PrintHandler implements VisitorHandler{

    private PrintStream out;
    private int step = 0;

    public PrintHandler(PrintStream pringStream) {
        this.out = pringStream;
    }

    @Override
    public void onVisitStart(Rule rule, boolean isAbstractRule) {
        doSteps();
        out.println(rule.getClass().getSimpleName() + " (" + rule + ")");
        step ++;
    }

    @Override
    public void onVisitEnd(Rule rule, boolean isAbstractRule) {
        step --;
    }

    private void doSteps(){
        for (int i = 0; i < step; i++) {
            out.print("  ");
        }
    }

}
